JP7481519B1 - Buckling Restrained Brace - Google Patents

Abstract

[Problem] To provide a buckling restrained brace that can reliably suppress both local buckling and global buckling. [Solution] A buckling restrained brace 100 that is attached to a structure includes a core material 10, a local buckling restraining member 20 that covers the core material 10, and a global buckling restraining member 30 that covers the core material 10 and the local buckling restraining member 20, the local buckling restraining member 20 restraining local buckling of the core material 10, and the global buckling restraining member 30 restraining global buckling of the core material 10. [Selected Figure] Figure 1

Description

The present invention relates to a buckling restraint brace.

Buckling-restrained braces are used to reinforce buildings and other structures. Buckling-restrained braces prevent the core material from buckling by attaching a restraining material to the core material.
Patent Document 1 discloses a structure in which slits are provided at the longitudinal ends of the wood restraint material to prevent interference with the core material stiffening member in order to prevent the wood restraint material from cracking due to deformation of the core material.
Patent Document 2 discloses a structure in which a first restraining member and a second restraining member are in close contact with a core material from both sides in the plate thickness direction, with the aim of ensuring performance in terms of compressive strength.

Patent No. 6995239 Patent No. 6942280

Wood is sometimes used as a restraining material for buckling restraint braces. Wood is relatively effective at restraining the overall buckling of the core material, but is relatively ineffective at restraining local buckling of the core material. In addition, when wood dries and shrinks, gaps form between the core material and the wood, which reduces the effect of restraining local buckling of the core material.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a buckling restraint brace that can reliably suppress both local buckling and global buckling.

<1> The buckling restraint brace according to aspect 1 of the present invention is a buckling restraint brace that is attached to a structure, and includes a core material, a local buckling restraint member that covers the core material, and a global buckling restraint member that covers the core material and the local buckling restraint member, characterized in that the local buckling restraint member restrains local buckling of the core material, and the global buckling restraint member restrains global buckling of the core material.

According to this invention, the local buckling suppression member suppresses local buckling of the core material, and the global buckling suppression member suppresses global buckling of the core material. For example, when wood is used as a member for suppressing buckling of the core material, the effect of suppressing global buckling of the core material is relatively large, but the effect of suppressing local buckling of the core material is relatively small. For example, when gaps occur between the core material and the wood due to drying shrinkage of the wood, the effect of suppressing local buckling may be further reduced.

In response to this, as described above, a member that suppresses local buckling of the core material and a member that suppresses global buckling are provided separately. In this way, even if wood is used as a member that suppresses global buckling of the core material, for example, by using a different member as the member that suppresses local buckling of the core material, it is possible to reliably suppress both local buckling and global buckling while taking advantage of the characteristics of the material.

<2> The buckling restraint brace according to aspect 2 of the present invention is the buckling restraint brace according to aspect 1, characterized in that the length of the local buckling restraint member along the longitudinal direction of the core material is longer than the length of the plasticized portion of the core material along the longitudinal direction.

According to this invention, the length of the local buckling suppression member along the longitudinal direction of the core material is longer than the length of the plasticized portion of the core material along the longitudinal direction. This makes it possible to reliably suppress the occurrence of local buckling over the entire longitudinal direction of the plasticized portion of the core material.

<3> The buckling restraint brace according to aspect 3 of the present invention is the buckling restraint brace according to aspect 1 or 2, characterized in that notches are provided at both longitudinal ends of the local buckling restraint member.

Here, stiffening members may be provided at both ends of the core material. In this case, if the length of the local buckling suppression member is longer than the plasticized portion of the core material, both ends of the local buckling suppression member may interfere with the stiffening members provided on the core material. In response to this, notches are provided at both longitudinal ends of the local buckling suppression member. This makes it possible to prevent both ends of the local buckling suppression member from interfering with the stiffening members of the core material.

<4> The buckling restraint brace according to aspect 4 of the present invention is a buckling restraint brace according to any one of aspects 1 to 3, characterized in that the rigidity of the local buckling restraint member is higher than the rigidity of the global buckling restraint member.

According to this invention, the rigidity of the local buckling suppression member is higher than the rigidity of the global buckling suppression member. This allows the local buckling suppression member to be specialized to suppress local buckling of the core material. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace.

<5> The buckling restraint brace according to aspect 5 of the present invention is a buckling restraint brace according to any one of aspects 1 to 4, characterized in that the strength of the local buckling restraint member is greater than the strength of the global buckling restraint member.

According to this invention, the strength of the local buckling suppression member is greater than the strength of the global buckling suppression member. This allows the local buckling suppression member to be specialized to suppress local buckling of the core material. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace.

<6> The buckling restraint brace according to aspect 6 of the present invention is a buckling restraint brace according to any one of aspects 1 to 5, characterized in that the dimensional stability of the local buckling restraint member is higher than the dimensional stability of the overall buckling restraint member.

According to this invention, the dimensional stability of the local buckling suppression member is higher than that of the overall buckling suppression member. This makes it possible to prevent gaps from occurring between the core material and the local buckling suppression member, even due to, for example, deterioration over time. Therefore, local buckling of the core material can be suppressed for a long period of time.

<7> The buckling restraint brace according to aspect 7 of the present invention is a buckling restraint brace according to any one of aspects 1 to 6, characterized in that the overall buckling restraint member is wood, and the local buckling restraint member is steel, mortar, FRP, or wood with a higher specific strength than the wood.

According to this invention, the global buckling suppression member is wood. By using wood for the global buckling suppression member, a structure suitable for suppressing global buckling of the core material can be obtained. The local buckling suppression member is wood with a higher specific strength than steel, mortar, FRP, or the wood used for the global buckling suppression member. This solves the problem that the wood used for the global buckling suppression member has a relatively small effect of suppressing local buckling of the core material. In other words, the local buckling suppression member can be used to obtain a structure suitable for suppressing local buckling of the core material.

<8> The buckling restraint brace according to aspect 8 of the present invention is a buckling restraint brace according to any one of aspects 1 to 7, characterized in that the global buckling restraint member restrains only the global buckling of the core material.

According to this invention, the global buckling suppression member suppresses only the global buckling of the core material. This allows the global buckling suppression member to be specialized for suppressing the global buckling of the core material. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace.

<9> The buckling restraint brace according to aspect 9 of the present invention is a buckling restraint brace according to any one of aspects 1 to 8, characterized in that the local buckling restraint member includes a first reinforcing member arranged on one of both sides of the core material that face in the thickness direction of the core material, and a second reinforcing member arranged on the other of both sides, and the overall buckling restraint member includes a wooden restraint member that covers the outer periphery of the core material, the first reinforcing member, and the second reinforcing member, and the first reinforcing member is fixed to the one side by a first tubular member, and the second reinforcing member is fixed to the other side by a second tubular member.

According to this invention, the local buckling suppression member includes a first reinforcing member and a second reinforcing member. This allows the local buckling suppression member to be disposed on both side surfaces of the core material that face the thickness direction of the core material. This makes it possible to reliably suppress buckling of the core material in the thickness direction of the core material.

The overall buckling suppression member includes a wooden restraining member that covers the outer periphery of the core material, the first reinforcing member, and the second reinforcing member. The first reinforcing member is fixed to one side by the first tubular member, and the second reinforcing member is fixed to the other side by the second tubular member. In other words, the local buckling suppression member is covered by the wooden restraining member. By providing the local buckling suppression member on the core material, the overall buckling suppression member can only respond to forces related to the overall buckling of the core material. Therefore, for example, it is possible to suppress the wooden restraining member from cracking. For example, even if the wooden restraining member is deformed due to drying shrinkage, etc., it is possible to reliably suppress local buckling of the core material.

<10> The buckling restraint brace according to aspect 10 of the present invention is the buckling restraint brace according to aspect 9, characterized in that the wooden restraint member has a first through hole and a second through hole, the outer diameter of the first tubular member is larger than the inner diameter of the first through hole, the outer diameter of the second tubular member is larger than the inner diameter of the second through hole, the first tubular member is press-fitted into the first through hole, and the second tubular member is press-fitted into the second through hole.

According to this invention, the outer diameter of the first tubular member is larger than the inner diameter of the first through hole. The outer diameter of the second tubular member is larger than the inner diameter of the second through hole. The first tubular member is press-fitted into the first through hole. The second tubular member is press-fitted into the second through hole. This allows the wooden restraining member to be securely fixed to the first and second tubular members.

<11> The buckling restraint brace according to aspect 11 of the present invention is the buckling restraint brace according to aspect 9 or 10, characterized in that the thickness of the first reinforcement member in the plate thickness direction is the same as the thickness of the second reinforcement member in the plate thickness direction.

According to this invention, the thickness of the first reinforcement member in the plate thickness direction is the same as the thickness of the second reinforcement member in the plate thickness direction. This allows the structure of the buckling suppression member to be symmetrical with respect to the core material. This makes it easier to design the buckling restraint brace.

<12> The buckling restraint brace according to aspect 12 of the present invention is a buckling restraint brace according to any one of aspects 9 to 11, characterized in that the first tubular member is a sheath tube or a thick-walled pipe, and the second tubular member is a sheath tube or a thick-walled pipe.

According to this invention, the first tubular member is a sheath tube or a thick-walled pipe. The second tubular member is a sheath tube or a thick-walled pipe. In this way, by using prefabricated members for the first and second tubular members, the cost of the buckling restraint brace can be reduced. Also, for example, if the sheath tube or the thick-walled pipe is cylindrical, the first and second through holes of the wooden restraint member can be made circular. Therefore, the first and second through holes can be provided without special processing of the wooden restraint member. This improves workability.

<13> The buckling restraint brace according to aspect 13 of the present invention is a buckling restraint brace according to any one of aspects 9 to 12, characterized in that the first reinforcing member is fixed to the one side by a third tubular member, the third tubular member is positioned at a different position from the first tubular member in the longitudinal direction of the core material, the first tubular member is one of a sheath tube and a thick-walled pipe, and the third tubular member is the other of the sheath tube and the thick-walled pipe.

According to this invention, the third tubular member is arranged at a different position from the first tubular member in the longitudinal direction of the core material. The first tubular member is either a sheath tube or a thick-walled pipe, and the third tubular member is the other of a sheath tube and a thick-walled pipe. In other words, a mixture of sheath tubes and thick-walled pipes is arranged in the longitudinal direction of the core material. This makes it possible, for example, to provide a regularity in the arrangement of the sheath tubes or thick-walled pipes, which can serve as a marker for the position of the buckling restraint brace.

<14> The buckling restraint brace according to aspect 14 of the present invention is a buckling restraint brace according to any one of aspects 9 to 13, further comprising an unbonded material, the unbonded material being interposed between the first reinforcement material and the core material, and being interposed between the second reinforcement material and the core material.

Here, when the plasticized portion of the core material is deformed by an external force, if the first reinforcement material and the second reinforcement material follow and deform, the durability of the core material may not be as designed. In response to this, the unbonded material is interposed between the first reinforcement material and the core material, and between the second reinforcement material and the core material. This makes it possible to prevent the first reinforcement material and the second reinforcement material from following the deformation of the plasticized portion of the core material. Therefore, the durability of the core material can be maintained as designed.

<15> The buckling restraint brace according to aspect 15 of the present invention is a buckling restraint brace according to any one of aspects 9 to 14, characterized in that the distance between the core material and the wooden restraint member is maintained constant by disposing the first reinforcement member and the second reinforcement member between the core material and the wooden restraint member.

According to this invention, the distance between the core material and the wooden restraining member is maintained constant by disposing the first reinforcing member and the second reinforcing member between the core material and the wooden restraining member. This ensures a constant gap between the wooden restraining member and the core material. Therefore, the wooden restraining member can function only as a global buckling suppression member.

The present invention provides a buckling restraint brace that can reliably suppress both local and global buckling.

FIG. 1 is a front view of a buckling restraint brace. 2 is a cross-sectional view of the II-II portion shown in FIG. 1. 3 is a cross-sectional view taken along line III-III of FIG. 1.

A buckling restrained brace 100 according to one embodiment of the present invention will be described below with reference to the drawings. The buckling restrained brace 100 is attached to a structure such as a building, for example. In this way, the buckling restrained brace 100 reinforces the structure.
As shown in FIG. 1 , the buckling restraint brace 100 includes a core material 10 , a local buckling restraint member 20 , a global buckling restraint member 30 , and an unbonded material 40 .

The core material 10 is a flat plate made of steel plate. Both ends of the core material 10 are attached to the structure of the building to reinforce the building. As shown in FIG. 1, the core material 10 has, for example, a narrow width portion 11, a wide width portion 12, and a width-changing portion 13.

The narrow width portion 11 is located in the center of the longitudinal direction of the core material 10. The wide width portions 12 are located at both ends of the longitudinal direction of the core material 10. The width of the wide width portion 12 in the plate width direction of the core material 10 is wider than the width of the narrow width portion 11 in the plate width direction of the core material 10. The length of the wide width portion 12 along the longitudinal direction of the core material 10 is shorter than the length of the narrow width portion 11 along the longitudinal direction of the core material 10.
Since the longitudinal center of the core material 10 is a narrow width portion 11 and the longitudinal ends are wide width portions 12, the longitudinal center of the core material 10 (narrow width portion 11) becomes an area that is easily plasticized, and the plasticized portion is limited to the center.

As shown in FIG. 1, the width changing portion 13 is a boundary region between the wide portion 12 and the narrow portion 11. The width of the width changing portion 13 along the plate width direction of the core material 10 changes along the longitudinal direction. The width of the width changing portion 13 narrows from the longitudinal end portion of the core material 10 (i.e., the wide portion 12 side) toward the longitudinal center portion of the core material 10 (i.e., the narrow portion 11 side). When viewed along the plate thickness direction, the side surface in the plate width direction of the width changing portion 13 is linear and inclined relative to the longitudinal direction. The width changing portion 13 absorbs, for example, an additional bending moment acting on the core material 10.

The stiffening member 14 is a plate-shaped member made of steel plate. The stiffening member 14 reinforces both ends of the core material 10 and prevents the core material 10 from bending in the thickness direction. The stiffening member 14 is joined to the wide portion 12 of the core material 10 by welding. A welded portion 14W is formed at the joint between the core material 10 and the stiffening member 14.

The stiffening members 14 are provided on the front and back surfaces (i.e., the surfaces facing the thickness direction of the core material 10) of the wide portion 12. The core material 10 and the stiffening members 14 have a cross-shaped cross section.
Bolt holes (not shown) are formed in the stiffening members 14 and the wide portions 12. The buckling restraint brace 100 is attached to a structure by bolts (not shown) that are inserted into the bolt holes.

The local buckling suppression member 20 covers the core material 10. The local buckling suppression member 20 suppresses local buckling of the core material 10. In this embodiment, local buckling of the core material 10 refers to local deformation of the core material 10 when a compressive force is applied in the longitudinal direction of the core material 10. The local buckling suppression member 20 includes a first reinforcing member 21, a second reinforcing member 22, and a third reinforcing member 23.
The first reinforcing member 21 is disposed on one of both side surfaces of the core material 10, each of which faces in the thickness direction of the core material 10. The first reinforcing member 21 is fixed to the one side only by fastening members F, for example, as shown in FIG. 2. In this embodiment, the fastening members F are a bolt B, a nut N, and a washer W. Hereinafter, the portion where the first reinforcing member 21 and a second reinforcing member 22 described later are fixed to the one side or the other only by the fastening members F will be referred to as a first fixing portion F1. As shown in FIG. 1, a plurality of first fixing portions F1 are provided at intervals along the longitudinal direction of the core material 10.

Alternatively, the first reinforcing member 21 is fixed to the one side by the first cylindrical member P1 as shown in FIG. 3. Specifically, the first reinforcing member 21 is fixed to the one side by the fastening member F via the first cylindrical member P1 as shown in FIG. 3. Hereinafter, the portion where the first reinforcing member 21 and the second reinforcing member 22 described later are fixed to the one side or the other side by the fastening member F via the first cylindrical member P1 or the second cylindrical member P2 described later is referred to as the second fixing portion F2. As shown in FIG. 1, the second fixing portion F2 is provided in a plurality of places at intervals along the longitudinal direction of the core material 10. In other words, the first cylindrical member P1 is provided in a plurality of places at intervals along the longitudinal direction of the core material 10.

When the first reinforcing material 21 is fixed to the one side via the first tubular member P1, as shown in Fig. 3, one end in the longitudinal direction of the first tubular member P1 contacts the first reinforcing material 21. The other end in the longitudinal direction of the first tubular member P1 contacts the washer W of the fastening member F. By fastening the fastening member F in this state, the first tubular member P1 presses the first reinforcing material 21 against the core material 10. As a result, the first reinforcing material 21 is fixed to one of the both side surfaces of the core material 10 by the first tubular member P1.
In this embodiment, the first cylindrical member P1 is, for example, a thick-walled pipe as shown in Fig. 3. Alternatively, the first cylindrical member P1 may be a sheath tube (not shown).

The second reinforcing member 22 is disposed on the other of the two side surfaces of the core material 10 that face in the thickness direction of the core material 10. The second reinforcing member 22 is fixed to the other of the two side surfaces at the first fixing portion F1 by only the fastening member F, for example, as shown in FIG.
Alternatively, the second reinforcing member 22 is fixed to the other by a second tubular member P2 as shown in Fig. 3. Specifically, the second reinforcing member 22 is fixed to the other by a fastening member F via the second tubular member P2 at a second fixing portion F2 as shown in Fig. 3.

As shown in FIG. 3, it is preferable that the first tubular member P1 and the second tubular member P2 are provided at the same location in the longitudinal direction of the buckling restraint brace 100. Therefore, similar to the first tubular member P1, multiple second tubular members P2 are provided at intervals along the longitudinal direction of the core material 10.

When the second reinforcing member 22 is fixed to the other side via the second tubular member P2, as shown in Fig. 3, one end in the longitudinal direction of the second tubular member P2 contacts the second reinforcing member 22. The other end in the longitudinal direction of the second tubular member P2 contacts the washer W of the fastening member F. By fastening the fastening member F in this state, the second tubular member P2 presses the second reinforcing member 22 against the core material 10. As a result, the second reinforcing member 22 is fixed to the other of both side surfaces of the core material 10 by the second tubular member P2.
In this embodiment, the second cylindrical member P2 is, for example, a thick-walled pipe as shown in Fig. 3. Alternatively, the second cylindrical member P2 may be a sheath tube (not shown).

With the above configuration, as shown in FIG. 3, it is preferable to fix the first reinforcing member 21 to the one side via the first tubular member P1 and fix the second reinforcing member 22 to the other side via the second tubular member P2, so that the first reinforcing member 21 and the second reinforcing member 22 can suppress local buckling of the core material 10.

In the second fixing portion F2, as shown in FIG. 3, a sheath tube and a thick-walled pipe may be provided in a mixed manner.
That is, for example, the first reinforcing member 21 may be fixed to one of both side surfaces of the core material 10 by the third tubular member P3. At this time, the third tubular member P3 is disposed at a position different from the first tubular member P1 in the longitudinal direction of the core material 10. The third tubular member P3 is press-fitted into the first through-hole 31ah of the first wooden restraining member 31a. In this case, the first tubular member P1 is one of the sheath tube and the thick-walled pipe, and the third tubular member P3 is the other of the sheath tube and the thick-walled pipe.

For example, the second reinforcing member 22 may be fixed to the other of the two side surfaces of the core material 10 by a third tubular member P3. In this case, the third tubular member P3 is disposed at a position different from the second tubular member P2 in the longitudinal direction of the core material 10. The third tubular member P3 is press-fitted into the second through-hole 31bh of the second wooden restraining member 31b. In this case, the second tubular member P2 is one of the sheath tube and the thick-walled pipe, and the third tubular member P3 is the other of the sheath tube and the thick-walled pipe.
Hereinafter, the third tubular member P3 will be described as being either one of the first tubular members P1 or the second tubular members P2 that are provided in plurality along the longitudinal direction of the core material 10.

In this embodiment, the thickness of the first reinforcing material 21 in the plate thickness direction is the same as the thickness of the second reinforcing material 22 in the plate thickness direction. The length of the first reinforcing material 21 in the longitudinal direction is the same as the length of the second reinforcing material 22 in the longitudinal direction. In other words, the first reinforcing material 21 and the second reinforcing material 22 are arranged symmetrically with respect to the core material 10.

The rigidity of the local buckling suppression member 20, i.e., the rigidity of the first reinforcement member 21 and the second reinforcement member 22, is higher than the rigidity of the overall buckling suppression member 30. The strength of the local buckling suppression member 20, i.e., the strength of the first reinforcement member 21 and the strength of the second reinforcement member 22, is higher than the strength of the overall buckling suppression member 30. As a result, while the overall buckling suppression member 30 suppresses the overall buckling of the core material 10 (details will be described later), the local buckling suppression member 20 has the function of suppressing local buckling of the core material 10. In this embodiment, the rigidity particularly refers to the rigidity against a force in the direction perpendicular to the axis. In this embodiment, the strength particularly refers to the strength against a force in the direction perpendicular to the axis.

The third reinforcing member 23 is a plate-like member arranged between the first reinforcing member 21 and the second reinforcing member 22. The third reinforcing member 23 is arranged on both side surfaces of the core material 10 in the plate width direction of the core material 10. In this way, the third reinforcing member 23 suppresses deformation of the core material 10 so as to bend in the plate width direction of the core material 10. As shown in Figures 2 and 3, the fastening member F is arranged so as to penetrate the third reinforcing member 23 at the first fixing portion F1 and the second fixing portion F2.

In this embodiment, it is preferable that the thickness of the third reinforcement member 23 is thicker than the thickness of the core material 10. This makes it possible, for example, to securely fix the local buckling suppression member 20 by allowing the fastening force of the fastening member F to be sufficiently applied to the third reinforcement member 23 when the first reinforcement member 21 and the second reinforcement member 22 are fastened together by the fastening member F.

The length of the local buckling suppression member 20 along the longitudinal direction of the core material 10 is longer than the length of the plasticized portion of the core material 10 along the longitudinal direction of the core material 10. In other words, the length of the first reinforcement member 21 and the second reinforcement member 22 is longer than the length of the narrow portion 11 of the core material 10. This allows the first reinforcement member 21 and the second reinforcement member 22 to reinforce the entire plasticized portion (narrow portion 11) of the core material 10. As shown in FIG. 1, a notch portion 20S is provided at both longitudinal ends of each of the first reinforcement member 21 and the second reinforcement member 22 of the local buckling suppression member 20. This prevents the first reinforcement member 21 and the second reinforcement member 22, which have the above-mentioned length, from interfering with the stiffening member 14.

In this embodiment, the dimensional stability of the local buckling suppression member 20 is higher than that of the overall buckling suppression member 30. In other words, the dimensional stability of each of the first reinforcement member 21 and the second reinforcement member 22 is higher than that of the wooden restraining member 31 described below. In this manner, for example, even after the wooden restraining member 31 is deformed due to drying shrinkage, local buckling of the core material 10 can be suppressed. In other words, the local buckling suppression member 20 is specialized for suppressing local buckling of the core material 10. In this embodiment, for example, steel, mortar, FRP, or wood with a higher specific strength than wood is used for the first reinforcement member 21 and the second reinforcement member 22 of the local buckling suppression member 20.

The global buckling suppression member 30 covers the core material 10 and the local buckling suppression member 20. The global buckling suppression member 30, for example, suppresses at least the global buckling of the core material 10. The global buckling suppression member 30 may, for example, suppress only the global buckling of the core material 10. In this embodiment, the global buckling of the core material 10 refers to deformation of the entire core material 10 in response to an external input.
The overall buckling restraining member 30 is made of wood. In other words, the overall buckling restraining member 30 includes a wooden restraining member 31.

The wooden restraining members 31 cover the outer periphery of the core material 10, the first reinforcing member 21, and the second reinforcing member 22. In this embodiment, the wooden restraining members 31 include a first wooden restraining member 31a and a second wooden restraining member 31b. Hereinafter, when there is no need to distinguish between these, they will be referred to as the wooden restraining members 31.
The first wooden restraining member 31a is disposed on the side of the first reinforcing member 21. The second wooden restraining member 31b is disposed on the side of the second reinforcing member 22. In this embodiment, the first wooden restraining member 31a and the second wooden member are disposed symmetrically with respect to the core material 10.
The distance between the core material 10 and the wooden restraining member 31 is maintained constant by disposing the first reinforcing member 21 and the second reinforcing member 22 between the core material 10 and the wooden restraining member 31 .

The wooden restraint member 31 has a first through hole 31ah and a second through hole 31bh. The first through hole 31ah and the second through hole 31bh are each provided in a plurality of positions spaced apart from one another in the longitudinal direction of the core material 10.
The first through hole 31ah is provided in the first wooden restraint member 31a. The first through hole 31ah is provided by, for example, drilling. The first cylindrical member P1 is press-fitted into the first through hole 31ah. In this embodiment, the outer diameter of the first cylindrical member P1 is larger than the inner diameter of the first through hole 31ah.
The second through hole 31bh is provided in the second wooden restraint member 31b. The second through hole 31bh is provided by, for example, drilling. The second cylindrical member P2 is press-fitted into the second through hole 31bh. In this embodiment, the outer diameter of the second cylindrical member P2 is larger than the inner diameter of the second through hole 31bh.

Next, the positional relationship between the wooden restraint member 31 of the global buckling restraint member 30 and the first reinforcing member 21 and the second reinforcing member 22 of the local buckling restraint member 20 will be described.
3, by tightening the bolt B and nut N of the fastening member F, the first tubular member P1 and the second tubular member P2 press the first reinforcing member 21 and the second reinforcing member 22 against the core material 10, respectively, as described above. As a result, the fastening member F fastens the first reinforcing member 21 and the second reinforcing member 22 via the first tubular member P1 and the second tubular member P2, so as to sandwich the core material 10 from both side surfaces in the plate thickness direction of the core material 10 with the first reinforcing member 21 and the second reinforcing member 22.

As described above, the first tubular member P1 and the second tubular member P2 are press-fitted into the first through-hole 31ah of the first wooden restraining member 31a and the second through-hole 31bh of the second wooden restraining member 31b, respectively. Therefore, by tightening the bolt B and nut N of the fastening member F, the first wooden restraining member 31a and the second wooden restraining member 31b are pressed against the first reinforcing member 21 and the second reinforcing member 22, respectively. This fixes the wooden restraining member 31 of the overall buckling suppression member 30 and the first reinforcing member 21 and the second reinforcing member 22 of the local buckling suppression member 20 to each other.

As shown in Figures 2 and 3, a gap S may occur between the first wooden restraint member 31a and the second wooden restraint member 31b. For example, if the buckling restraint brace 100 is required to have a stylish design, the design may be compromised if the first reinforcement member 21 and the second reinforcement member 22 are visible through the gap S. In response to this, it is preferable to place decorative wood D so as to cover the gap S, as shown in Figure 2.

2 and 3, it is preferable that the first wooden restraining member 31a and the second wooden restraining member 31b are provided with a countersunk hole H so that the fastening member F does not interfere with the overall buckling restraining member 30 or so that the fastening member F does not protrude from the overall buckling restraining member 30. It is preferable that the inner diameter of the countersunk hole H is larger than the outer diameter of the washer W of the fastening member F, for example, so that the washer W can be placed therein.

As shown in FIG. 2 , the countersunk holes H are provided only on the sides of the first wooden restraint member 31a and the second wooden restraint member 31b that face the core material 10, for example, so that they are not visible from the outside of the buckling restraint brace 100.
3, the countersunk holes H may be provided from the outside of the buckling restrained brace 100 along the thickness direction of the core material 10 so that, for example, the fastening member F can be fastened from the rear or the like via the first tubular member P1 or the second tubular member P2 press-fitted into the first wooden restraining member 31a or the second wooden restraining member 31b. In this way, when the countersunk holes H are located in a position visible from the outside of the buckling restrained brace 100, the countersunk holes H may be hidden by decorative wood D as shown in FIG.

The unbond material 40 is interposed, for example, between the first reinforcing material 21 and the core material 10, between the second reinforcing material 22 and the core material 10, and between the third reinforcing material 23 and the core material 10. In this way, the unbond material 40 has a function of suppressing the first reinforcing material 21 and the second reinforcing material 22 from deforming following the plasticized portion (narrow width portion 11) of the core material 10 when the plasticized portion (narrow width portion 11) is about to deform due to an external force. In this way, the unbond material 40 contributes to maintaining the durability of the plasticized portion (narrow width portion 11) of the core material 10 as designed.
The buckling restraint brace 100 according to this embodiment is formed from the above-described components.

As described above, according to the buckling restraint brace 100 of this embodiment, the local buckling suppression member 20 suppresses local buckling of the core material 10, and the global buckling suppression member 30 suppresses global buckling of the core material 10. For example, when wood is used as a member for suppressing the buckling of the core material 10, the effect of suppressing the global buckling of the core material 10 is relatively large, but the effect of suppressing the local buckling of the core material 10 is relatively small. For example, when a gap S occurs between the core material 10 and the wood due to drying shrinkage of the wood, the effect of suppressing local buckling may be further reduced.

In response to this, as described above, a member that suppresses local buckling of the core material 10 and a member that suppresses global buckling are provided separately. In this way, even if wood is used as a member that suppresses global buckling of the core material 10, for example, by using a different member as a member that suppresses local buckling of the core material 10, it is possible to reliably suppress both local buckling and global buckling while taking advantage of the characteristics of the material.

In addition, the length of the local buckling suppression member 20 along the longitudinal direction of the core material 10 is longer than the length of the plasticized portion of the core material 10 along the longitudinal direction. This makes it possible to reliably suppress the occurrence of local buckling over the entire longitudinal direction of the plasticized portion of the core material 10.

Here, stiffening members 14 may be provided at both ends of the core material 10. In this case, if the length of the local buckling suppression member 20 is longer than the plasticized portion of the core material 10, both ends of the local buckling suppression member 20 may interfere with the stiffening members 14 provided on the core material 10. In response to this, notches 20S are provided at both longitudinal ends of the local buckling suppression member 20. This makes it possible to prevent both ends of the local buckling suppression member 20 from interfering with the stiffening members 14 of the core material 10.

In addition, the rigidity of the local buckling suppression member 20 is higher than the rigidity of the global buckling suppression member 30. This allows the local buckling suppression member 20 to be specialized to suppress local buckling of the core material 10. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace 100.

In addition, the strength of the local buckling suppression member 20 is greater than the strength of the global buckling suppression member 30. This allows the local buckling suppression member 20 to be specialized to suppress local buckling of the core material 10. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace 100.

The dimensional stability of the local buckling suppression member 20 is higher than that of the overall buckling suppression member 30. This makes it difficult for a gap S to occur between the core material 10 and the local buckling suppression member 20, even due to, for example, deterioration over time. Therefore, local buckling of the core material 10 can be suppressed for a long period of time.

The overall buckling suppression member 30 is made of wood. By using wood for the overall buckling suppression member 30, a structure suitable for suppressing the overall buckling of the core material 10 can be obtained. The local buckling suppression member 20 is wood with a higher specific strength than steel, mortar, FRP, or the wood used for the overall buckling suppression member 30. This solves the problem that the wood used for the overall buckling suppression member 30 has a relatively small effect of suppressing the local buckling of the core material 10. In other words, the local buckling suppression member 20 can be used to obtain a structure suitable for suppressing the local buckling of the core material 10.

In addition, the global buckling suppression member 30 suppresses only the global buckling of the core material 10. This allows the global buckling suppression member 30 to be more specialized for suppressing the global buckling of the core material 10. This makes it possible to more reliably achieve the effect of reliably suppressing both local buckling and global buckling in the buckling restraint brace 100.

The local buckling suppression member 20 also includes a first reinforcing member 21 and a second reinforcing member 22. This allows the local buckling suppression member 20 to be arranged on both side surfaces of the core material 10 that face the thickness direction of the core material 10. This makes it possible to reliably suppress buckling of the core material 10 in the thickness direction of the core material 10.

The overall buckling suppression member 30 includes a wooden restraining member 31 that covers the outer circumference of the core material 10, the first reinforcing member 21, and the second reinforcing member 22. The first reinforcing member 21 is fixed to one side by the first tubular member P1, and the second reinforcing member 22 is fixed to the other side by the second tubular member P2. In other words, the local buckling suppression member 20 is covered by the wooden restraining member 31. By providing the local buckling suppression member 20 to the core material 10, the overall buckling suppression member 30 can only respond to forces related to the overall buckling of the core material 10. Therefore, for example, it is possible to suppress the wooden restraining member 31 from cracking. For example, even if the wooden restraining member 31 is deformed due to drying shrinkage, etc., it is possible to reliably suppress local buckling of the core material 10.

The outer diameter of the first tubular member P1 is larger than the inner diameter of the first through hole 31ah. The outer diameter of the second tubular member P2 is larger than the inner diameter of the second through hole 31bh. The first tubular member P1 is press-fitted into the first through hole 31ah. The second tubular member P2 is press-fitted into the second through hole 31bh. This allows the wooden restraint member 31 to be securely fixed to the first tubular member P1 and the second tubular member P2.

In addition, the thickness of the first reinforcement member 21 in the plate thickness direction is the same as the thickness of the second reinforcement member 22 in the plate thickness direction. This allows the structure of the buckling suppression member to be symmetrical with respect to the core member 10. This makes it easier to design the buckling restraint brace 100.

The first tubular member P1 is a sheath tube or a thick-walled pipe. The second tubular member P2 is a sheath tube or a thick-walled pipe. In this way, by using prefabricated members for the first tubular member P1 and the second tubular member P2, the cost of the buckling restraint brace 100 can be reduced. In addition, for example, if the sheath tube or the thick-walled pipe is cylindrical, the first through hole 31ah and the second through hole 31bh of the wooden restraint member 31 can be made circular. Therefore, the first through hole 31ah and the second through hole 31bh can be provided without performing special processing on the wooden restraint member 31. This improves workability.

The third tubular member P3 is arranged at a different position from the first tubular member P1 in the longitudinal direction of the core material 10. The first tubular member P1 is either a sheath tube or a thick-walled pipe, and the third tubular member P3 is the other of a sheath tube and a thick-walled pipe. In other words, a mixture of sheath tubes and thick-walled pipes is arranged in the longitudinal direction of the core material 10. This makes it possible, for example, to provide a regularity in the arrangement of the sheath tubes or thick-walled pipes, which can serve as a marker for the position of the buckling restraint brace 100.

Here, when the plasticized portion of the core material 10 is deformed by an external force, if the first reinforcement material 21 and the second reinforcement material 22 follow and deform, the durability of the core material 10 may not be as designed. In response to this, the unbond material 40 is interposed between the first reinforcement material 21 and the core material 10, and between the second reinforcement material 22 and the core material 10. This makes it possible to prevent the first reinforcement material 21 and the second reinforcement material 22 from following the deformation of the plasticized portion of the core material 10. Therefore, the durability of the core material 10 can be maintained as designed.

The distance between the core material 10 and the wooden restraining member 31 is maintained constant by disposing the first reinforcing member 21 and the second reinforcing member 22 between the core material 10 and the wooden restraining member 31. This ensures a constant gap S between the wooden restraining member 31 and the core material 10. Therefore, the wooden restraining member 31 can function only as a global buckling suppression member 30.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, mortar may be used as the first reinforcing member 21 and the second reinforcing member 22 of the local buckling suppression member 20. In this case, for example, the local buckling suppression member 20 may be formed by using wood as a formwork and pouring mortar onto both side surfaces of the core material 10 and allowing it to harden.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

10 Core material 11 Narrow width portion 12 Wide width portion 13 Width change portion 14 Stiffening member 14W Welded portion 20 Local buckling restraint member 20S Notch portion 21 First reinforcing member 22 Second reinforcing member 23 Third reinforcing member 30 Overall buckling restraint member 31 Wooden restraint member 31a First wooden restraint member 31ah First through hole 31b Second wooden restraint member 31bh Second through hole 40 Unbonded material 100 Buckling restraint brace B Bolt D Decorative wood F Fastening member H Countersunk hole N Nut P1 First tubular member P2 Second tubular member P3 Third tubular member S Gap W Washer

Claims (20)

A buckling restraint brace for installation in a structure, comprising:
A core material;
A local buckling suppression member covering the core material;
a total buckling suppression member covering the core material and the local buckling suppression member;
Equipped with
The local buckling suppression member suppresses local buckling of the core material by restraining the core material from both opposing directions,
The overall buckling suppression member suppresses overall buckling of the core material,
The overall buckling restraint member is made of wood.
A buckling restrained brace characterized by: A buckling restraint brace for installation in a structure, comprising:
A core material;
A local buckling suppression member covering the core material;
a total buckling suppression member covering the core material and the local buckling suppression member;
Equipped with
The local buckling suppression member suppresses local buckling of the core material by restraining the core material from both opposing directions,
The overall buckling suppression member suppresses overall buckling of the core material,
The core material and the local buckling suppression member are not fixed to each other.
A buckling restrained brace characterized by: A buckling restraint brace for installation in a structure, comprising:
A core material;
A local buckling suppression member covering the core material;
a total buckling suppression member covering the core material and the local buckling suppression member;
Equipped with
the local buckling suppression member suppresses local buckling of the core material by restraining the core material from both opposing directions,
The overall buckling suppression member suppresses overall buckling of the core material,
The length of the local buckling suppression member along the longitudinal direction of the core material is longer than the length of the plasticized portion of the core material along the longitudinal direction,
The core material is configured in a plate shape, and the width of the plasticized portion in the plate width direction is narrower than the width of a portion of the core material other than the plasticized portion in the plate width direction.
A buckling restrained brace characterized by: A buckling restraint brace for installation in a structure, comprising:
A core material;
A local buckling suppression member covering the core material;
a total buckling suppression member covering the core material and the local buckling suppression member;
Equipped with
The local buckling suppression member suppresses local buckling of the core material by restraining the core material from both opposing directions,
The overall buckling suppression member suppresses overall buckling of the core material,
The local buckling suppression member includes:
A first reinforcing member is arranged on one of both side surfaces of the core material, the both side surfaces facing the thickness direction of the core material;
A second reinforcing member disposed on the other of the two side surfaces;
Including,
The overall buckling restraint member is
a wooden restraining member covering an outer periphery of the core material, the first reinforcing material, and the second reinforcing material;
Including,
The first reinforcing member is fixed to the one side by a first tubular member,
The second reinforcing member is fixed to the other reinforcing member by a second tubular member.
A buckling restrained brace characterized by: In the longitudinal direction of the core material, both ends of the local buckling restraint member are located inward from both ends of the global buckling restraint member.
2. The buckling restrained brace of claim 1. The length of the local buckling suppression member along the longitudinal direction of the core material is longer than the length of the plasticized portion of the core material along the longitudinal direction.
2. The buckling restrained brace of claim 1. A notch is provided at each of both longitudinal ends of the local buckling suppression member.
7. The buckling restrained brace of claim 6 . The rigidity of the local buckling restraint member is higher than the rigidity of the global buckling restraint member.
8. The buckling restrained brace of claim 1 . The strength of the local buckling restraint member is higher than the strength of the global buckling restraint member.
8. The buckling restrained brace of claim 1 . The dimensional stability of the local buckling restraint member is higher than the dimensional stability of the overall buckling restraint member.
8. The buckling restrained brace of claim 1 . The overall buckling restraint member is made of wood,
The local buckling suppression member is a steel material, a mortar, an FRP, or a wood material having a specific strength higher than that of the wood material.
8. The buckling restrained brace of claim 1 . The overall buckling suppression member suppresses only the overall buckling of the core material.
8. The buckling restrained brace of claim 1 . The local buckling suppression member includes:
A first reinforcing member is arranged on one of both side surfaces of the core material, the both side surfaces facing the thickness direction of the core material;
A second reinforcing member disposed on the other of the two side surfaces;
Including,
The overall buckling restraint member is
a wooden restraining member covering an outer periphery of the core material, the first reinforcing material, and the second reinforcing material;
Including,
The first reinforcing member is fixed to the one side by a first tubular member,
The second reinforcing member is fixed to the other reinforcing member by a second tubular member.
8. The buckling restrained brace of any one of claims 1 to 3 and 5 to 7 . The wooden restraining member includes a first through hole and a second through hole,
The outer diameter of the first cylindrical member is larger than the inner diameter of the first through hole,
The outer diameter of the second cylindrical member is larger than the inner diameter of the second through hole,
The first cylindrical member is press-fitted into the first through hole,
The second cylindrical member is press-fitted into the second through hole.
14. The buckling restrained brace of claim 13 . The thickness of the first reinforcing material in the plate thickness direction is the same as the thickness of the second reinforcing material in the plate thickness direction.
15. The buckling restrained brace of claim 14 . The first tubular member is a sheath tube or a thick-walled pipe,
The second tubular member is a sheath tube or a thick-walled pipe.
16. The buckling restrained brace of claim 15 . The first reinforcing member is fixed to the one side by a third tubular member,
The third tubular member is disposed at a position different from that of the first tubular member in the longitudinal direction of the core material,
the first tubular member is one of a sheath tube and a thick-walled pipe;
The third cylindrical member is the other of the sheath tube and the thick-walled pipe.
17. The buckling restrained brace of claim 16 . Unbonded material,
Further comprising:
The unbonded material is interposed between the first reinforcing material and the core material, and is also interposed between the second reinforcing material and the core material.
20. The buckling restrained brace of claim 17 . The distance between the core material and the wooden restraining member is maintained constant by disposing the first reinforcing member and the second reinforcing member between the core material and the wooden restraining member.
20. The buckling restrained brace of claim 18 . The local buckling suppression member includes:
A first reinforcing member is arranged on one of both side surfaces of the core material, the both side surfaces facing the thickness direction of the core material;
A second reinforcing member disposed on the other of the two side surfaces;
Including,
The first reinforcing member is fixed to the one side by a first tubular member,
The second reinforcing member is fixed to the other reinforcing member by a second cylindrical member,
The first tubular member and the second tubular member are housed inside the overall buckling suppression member.
8. The buckling restrained brace of claim 1 .

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